Observation of an asymmetry in the thermal hysteresis loop at the scale of a single spin-crossover particle

被引：19

作者：

Arnaud, Carole ^{[1
]}

Forestier, Thibaut ^{[2
]}

Daro, Nathalie ^{[2
]}

Freysz, Eric ^{[3
]}

Letard, Jean-Francois ^{[2
]}

Pauliat, Gilles ^{[1
]}

Roosen, Gerald ^{[1
]}

机构：

[1] Univ Paris Sud, CNRS, Lab Charles Fabry, Inst Opt, F-91127 Palaiseau, France

[2] Univ Bordeaux 1, Inst Chim Mat Condensee Bordeaux, CNRS, Grp Sci Mol, F-33608 Pessac, France

[3] Univ Bordeaux 1, Ctr Phys Mol Opt & Hertzienne, CNRS, UMR 5798,Grp Photo Phys Syst Mol, F-33405 Talence, France

来源：

CHEMICAL PHYSICS LETTERS | 2009年 / 470卷 / 1-3期

关键词：

NANOPARTICLES; TEMPERATURE; TRANSITION;

D O I：

10.1016/j.cplett.2009.01.014

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have studied the spin-crossover phenomenon of single isolated micro-particles using a Differential Interference Microscope (DIC) operating in transmission mode. For that we have selected the [Fe(NH2-trz)(3)]Br-2-2.5H(2)O coordination polymer complex well-known to exhibit, at room temperature, a spin transition with a large thermal hysteresis loop. The comparison of the thermal hysteresis loop of several isolated micro-particles demonstrates some heterogeneity and also an obvious asymmetry of the cycle. The warming branch clearly appears more abrupt than the cooling branch. We also report some correlations between the threshold temperature and the size of the particles. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：131 / 135

页数：5

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